20424123 has 16 divisors (see below), whose sum is σ = 32038560. Its totient is φ = 12814848.

The previous prime is 20424113. The next prime is 20424137. The reversal of 20424123 is 32142402.

It is not a de Polignac number, because 20424123 - 2¹² = 20420027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20424096 and 20424105.

It is not an unprimeable number, because it can be changed into a prime (20424113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21790 + ... + 22707.

It is an arithmetic number, because the mean of its divisors is an integer number (2002410).

Almost surely, 2^20424123 is an apocalyptic number.

20424123 is a deficient number, since it is larger than the sum of its proper divisors (11614437).

20424123 is a wasteful number, since it uses less digits than its factorization.

20424123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44523 (or 44517 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20424123 is about 4519.3055882514. The cubic root of 20424123 is about 273.3471010647.

Adding to 20424123 its reverse (32142402), we get a palindrome (52566525).

It can be divided in two parts, 20424 and 123, that multiplied together give a palindrome (2512152).

The spelling of 20424123 in words is "twenty million, four hundred twenty-four thousand, one hundred twenty-three".